GB1343981A - Apparatus for controlling the supply of electrical power to a load - Google Patents

Apparatus for controlling the supply of electrical power to a load

Info

Publication number
GB1343981A
GB1343981A GB1343981DA GB1343981A GB 1343981 A GB1343981 A GB 1343981A GB 1343981D A GB1343981D A GB 1343981DA GB 1343981 A GB1343981 A GB 1343981A
Authority
GB
United Kingdom
Prior art keywords
pulse
current sensor
circuit
provides
supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of GB1343981A publication Critical patent/GB1343981A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
    • H02H1/043—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks to inrush currents
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)

Abstract

1343981 Protective arrangements DEFENCE SECRETARY OF STATE FOR 17 May 1972 [21 May 1971] 16182/71 Heading H2K An arrangement for controlling the supply to a load 2, includes a current sensor 4, a pulse shaping circuit 6 which provides a single pulse of predetermined shape, magnitude and duration when the current sensor output exceeds a predetermined magnitude, and a comparator circuit 7 which provides a control signal whenever the current sensor output is greater than the instantaneous voltage of the pulse. The control signal may cause the opening of a "contactor" formed by an electromagnetic relay or a thyristor switching circuit. The current sensor may be a magnetic amplifier if the power supply is from a D.C. source, or one or more current transformers if the supply is a single phase or multiphase A.C. source. A switch 8 is closed, when the contactor 3 is closed, to provide an input to a threshold circuit 5 which also has an input from the sensor and provides a signal to the pulse circuit 6 when the current sensor output exceeds the predetermined magnitude. A pulse shaping circuit is described, Fig. 2 (not shown), and provides a pulse shaped so that opening of the contactor does not occur under normal motor starting conditions or short transient overload conditions.
GB1343981D 1971-05-21 1971-05-21 Apparatus for controlling the supply of electrical power to a load Expired GB1343981A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1618271 1971-05-21

Publications (1)

Publication Number Publication Date
GB1343981A true GB1343981A (en) 1974-01-16

Family

ID=10072651

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1343981D Expired GB1343981A (en) 1971-05-21 1971-05-21 Apparatus for controlling the supply of electrical power to a load

Country Status (1)

Country Link
GB (1) GB1343981A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002017459A1 (en) * 2000-08-23 2002-02-28 Hi-Key Limited A control circuit for controlling a power supply to a motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002017459A1 (en) * 2000-08-23 2002-02-28 Hi-Key Limited A control circuit for controlling a power supply to a motor

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee